title: Tunable resistivity in magnetic glass phase of Gd(1-x)Ca(x)BaCo2O5.5.
abstract: We present magnetization and resistance measurements carried out on pristine and Ca-doped Gd(1-x)Ca(x)BaCo2O5.5 (x = 0.02) samples using the cooling and heating in unequal field (CHUF) protocol. The measurements reveal that the high temperature ferromagnetic phase is kinetically arrested at low temperature when the sample is cooled in a magnetic field. The volume fraction of this arrested phase increases upon Ca substitution and also by increasing the field in which the sample is cooled. Since the ferromagnetic phase is less resistive when compared to the low temperature antiferromagnetic phase, a tunable resistance is achieved in the sample by cooling in different magnetic fields. By cooling in magnetic fields of 9 T a reduction in resistivity by an order of magnitude is achieved. These results are consistent with the coexistence of the low temperature equilibrium antiferromagnetic phase with kinetically arrested high temperature ferromagnetic phase in the system.
authors.affiliation: Condensed Matter Physics Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India.
authors.forename: E P
authors.initials: EP
authors.lastname: Amaladass
authors.forename: N
authors.initials: N
authors.lastname: Thirumurugan
authors.forename: A T
authors.initials: AT
authors.lastname: Satya
authors.forename: C S
authors.initials: CS
authors.lastname: Sundar
authors.forename: A
authors.initials: A
authors.lastname: Bharathi